CN109058648B - Method for reinforcing and repairing surface damage continuous pipe by using composite material - Google Patents
Method for reinforcing and repairing surface damage continuous pipe by using composite material Download PDFInfo
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- CN109058648B CN109058648B CN201810696623.5A CN201810696623A CN109058648B CN 109058648 B CN109058648 B CN 109058648B CN 201810696623 A CN201810696623 A CN 201810696623A CN 109058648 B CN109058648 B CN 109058648B
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- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 62
- 239000010410 layer Substances 0.000 claims abstract description 43
- 239000000853 adhesive Substances 0.000 claims abstract description 40
- 230000001070 adhesive effect Effects 0.000 claims abstract description 40
- 230000007547 defect Effects 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 230000008439 repair process Effects 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 19
- 239000010949 copper Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 19
- 239000011229 interlayer Substances 0.000 claims abstract description 17
- 239000003973 paint Substances 0.000 claims abstract 2
- 238000010276 construction Methods 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000011362 coarse particle Substances 0.000 claims description 4
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 claims description 4
- 229910021485 fumed silica Inorganic materials 0.000 claims description 4
- 229920005749 polyurethane resin Polymers 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000013008 thixotropic agent Substances 0.000 claims description 4
- 239000012745 toughening agent Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 239000003085 diluting agent Substances 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 238000001723 curing Methods 0.000 claims 5
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical group C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims 3
- 150000008065 acid anhydrides Chemical class 0.000 claims 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000013530 defoamer Substances 0.000 claims 1
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 238000005485 electric heating Methods 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 238000001029 thermal curing Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003733 fiber-reinforced composite Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004830 Super Glue Substances 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/175—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by using materials which fill a space around the pipe before hardening
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Pipe Accessories (AREA)
Abstract
本发明公开了一种用复合材料对表面损伤连续管补强修复的方法，采用的复合材料包括缺陷填充材料、层间胶粘剂、纤维增强材料片材、柔性铜质金属网和陶瓷颗粒胶粘剂，采用缺陷填充材料对管体损伤处进行修补，填平管体表面的损伤，采用层间胶粘剂涂刷纤维增强材料片材，然后将其粘贴在管体表面损伤处，采用柔性铜质金属网，将其紧贴在纤维增强材料片材上，涂刷高性能耐磨陶瓷颗粒胶粘剂并覆盖柔性铜质金属网，最终形成由缺陷填充材料、层间胶粘剂、纤维增强材料片材、柔性铜质金属网和陶瓷颗粒胶粘剂组成的复合材料修复层。由于复合材料与连续管在强度、韧性具有良好的匹配性，该方法防止了连续管因局部损伤而造成整盘失效，提高了连续管使用寿命。The invention discloses a method for reinforcing and repairing surface-damaged coiled pipes with composite materials. The defect filling material repairs the damaged part of the pipe body, fills in the damage on the surface of the pipe body, uses the interlayer adhesive to paint the fiber reinforced material sheet, and then sticks it on the damaged part of the pipe body surface, and uses a flexible copper metal mesh. It is closely attached to the fiber reinforced material sheet, coated with high-performance wear-resistant ceramic particle adhesive and covered with a flexible copper metal mesh, and finally forms a defect filling material, interlayer adhesive, fiber reinforced material sheet, and flexible copper metal mesh. Composite repair layer composed of ceramic particle adhesive. Since the composite material and the coiled tubing have good matching in strength and toughness, the method prevents the whole coil from failing due to local damage, and improves the service life of the coiled tubing.
Description
The technical field is as follows:
the invention relates to the technical field of petroleum and natural gas pipe repair, in particular to a method for repairing a damaged surface continuous pipe by using a composite material in a reinforcing way, so as to repair and reinforce the defects of corrosion, damage and the like of the outer wall of a service continuous pipe.
Background art:
coiled tubing has been widely used in the oil and gas industry in the fields of oil field workover, drilling, completion, logging, production increase, and the like. Because the coiled tubing operation technology has a series of technical advantages and operational advantages of high efficiency, low cost, wide operation range, small occupied area and the like, the coiled tubing plays an increasingly important role in the exploration, development, operation and yield increase of oil and gas fields.
The continuous pipe operation technology has large consumption of the continuous pipe and high requirement on the quality of the pipe. Domestic field investigation shows that under the condition of small operation quantity, each operation vehicle consumes more than 4000 meters of continuous pipes per year on average. According to foreign data, the quantity of continuous pipes is nearly 500 ten thousand meters every year in the world. Because the working conditions of the coiled tubing are severe and the stress state is complex, the failure modes are summarized to be mainly 3 types: (1) the plastic deformation is invalid, the continuous tube is subjected to dead bending, stretching necking deformation, flattening and the like; (2) the phenomena of overload fracture, stress brittle fracture, fatigue fracture and the like occur to the continuous pipe; (3) surface damage failure, uniform corrosion of the coiled tubing, local pitting or wear of the tubing wall during downhole operation and mechanical damage during operation. Corresponding measures are taken aiming at the failure type of the continuous pipe, the service life of the continuous pipe is prolonged, and the method has important significance for promoting the development of the petroleum industry.
Therefore, aiming at the problems of surface damage of the continuous pipe due to corrosion, abrasion, mechanical damage and the like, the invention provides a composite material reinforcement repair technology for implementing reinforcement repair on the defective position of the continuous pipe, thereby prolonging the service life of the continuous pipe and preventing the failure of the continuous pipe at the surface damage position first. The composite material reinforcing and repairing technology is that the composite material is wound on the outer surface of a continuous pipe with defects to form a composite repairing layer together with a super glue and a filler, and after repairing is completed, partial stress borne by the continuous pipe at the defect part is transmitted to the composite repairing layer, so that stress concentration at the defect part is reduced, local corrosion at the defect part is prevented, the bearing capacity of the defect part is improved, failure of the continuous pipe due to stress concentration, crack initiation, corrosion perforation, pipe body puncture and the like caused by local surface damage is avoided, and the service life of the continuous pipe is effectively prolonged.
The invention content is as follows:
the invention aims to provide a method for reinforcing and repairing a surface damaged continuous pipe by using a composite material, which adopts the composite material for reinforcing and repairing, has the advantages of lower cost, convenient construction and obvious repairing effect, and can effectively reduce the stress concentration of the damaged position and improve the bearing capacity of the pipe material of the damaged position because the composite material has good matching property with the strength and the toughness of the continuous pipe so that the stress born by the damaged position is transferred to a composite repairing layer, and meanwhile, the composite repairing layer can effectively prevent the partial corrosion of the damaged position from further occurring and ensure that the damaged continuous pipe reaches or exceeds the performance of a flawless continuous pipe, thereby effectively preventing the failure of the whole continuous pipe caused by the partial damage of the continuous pipe and prolonging the service life of the continuous pipe.
In order to achieve the purpose, the invention adopts the technical scheme that: a method of reinforcing and repairing a surface damaged coiled tubing with a composite material comprising a defect filler material, an interlayer adhesive, a fiber reinforced material sheet, a flexible copper metal mesh and a ceramic particle adhesive, the method comprising the steps of:
step 1: carrying out damage positioning on the continuous pipe to be reinforced and repaired, and creating a working environment;
step 2: treating the damaged surface and the surface of the coiled tubing near the damage to remove dirt and oxide skin at the damaged part and ensure that the surface of the coiled tubing to be repaired is oil-free and water-free;
and step 3: repairing the damaged part of the pipe body by adopting a defect filling material to fill and level up the damage on the surface of the pipe body;
and 4, step 4: coating a fiber reinforced material sheet with an interlayer adhesive, and then sticking the fiber reinforced material sheet to the damaged part of the surface of the pipe body;
and 5: adopting a flexible copper metal net, clinging the flexible copper metal net to a fiber reinforced material sheet, brushing a high-performance wear-resistant ceramic particle adhesive and covering the flexible copper metal net to finally form a composite material repairing layer consisting of a defect filling material, an interlayer adhesive, the fiber reinforced material sheet, the flexible copper metal net and the ceramic particle adhesive;
step 6: the composite material repairing layer is subjected to auxiliary curing by adopting a vacuumizing or heating method, so that the quality of the repairing layer is ensured;
and 7: and checking and accepting the repairing layer area of the continuous pipe, and making construction records.
The defect filling material consists of a component A and a component B, wherein the weight ratio of the component A to the component B is (5-6) to 1; the component A comprises the following materials in parts by weight: 40-80 parts of liquid bisphenol A epoxy resin, 15-40 parts of toughening agent polyurethane resin, 5-10 parts of thixotropic agent fumed silica, 20-50 parts of steel powder, 40-80 parts of silver powder and 30-60 parts of aluminum oxide; the component B comprises the following materials in parts by weight: 70-100 parts of modified anhydride curing agent and 30-50 parts of N, N dimethylbenzylamine; and adopting a rubber spatula to repair and fill the defect filling material to the damaged part of the pipe body in a putty shape.
The fiber reinforced material sheet is a glass fiber sheet or a carbon fiber sheet.
The interlayer adhesive consists of a third component and a fourth component, wherein the weight ratio of the third component to the fourth component is (3-4) to 1; the component C comprises the following materials in parts by weight: 50-100 parts of E-55 liquid bisphenol A epoxy resin, 20-40 parts of toughening agent polyurethane resin, 5-10 parts of thixotropic agent fumed silica, 10-30 parts of nano zinc oxide modified rubber powder, 10-30 parts of epoxy resin active diluent and 0.1-0.5 part of epoxy resin defoaming agent; the component D comprises the following materials in parts by weight: 60-90 parts of modified anhydride curing agent, 30-50 parts of N, N dimethylbenzylamine and 5-5901-5 parts of silane coupling agent; the shape of the interlayer adhesive is creamy, and the fiber reinforced material sheet is coated until the fiber reinforced material sheet is fully infiltrated.
The flexible copper metal net adopts a single-wire or multi-wire structure, the mesh density is large, the strength is high, the thickness of the metal net is 0.3-1.0mm, and the width is 100-400 mm.
The high-performance wear-resistant ceramic particle adhesive is formed by compounding wear-resistant coarse particles and a modified toughened heat-resistant curing agent, wherein the wear-resistant coarse particles comprise high-performance corundum, a ceramic material and silicon carbide.
The method for performing auxiliary curing on the composite material repairing layer by vacuumizing comprises the following steps: the tool for vacuumizing comprises a guide pipe, a vacuum pump and a vacuum bag, the periphery of the vacuum bag is adhered to the periphery of the composite material repairing layer through a sealing strip, the vacuum bag is compressed and sealed, the guide pipe is connected with the vacuum pump, the vacuum pump is started to vacuumize for 20-40 minutes, and vacuumizing can be stopped after the outer-layer wear-resistant ceramic particle adhesive is preliminarily cured.
The method for heating to carry out auxiliary curing on the composite material repairing layer comprises the following steps: and winding the self-temperature-control electric tracing band on the composite material repairing layer and the periphery of the composite material repairing layer, and then heating and curing.
The invention has the beneficial effects that:
1. the elastic modulus and the linear expansion coefficient of the defect filling material are close to those of a continuous pipe steel material, so that the synchronism of the defect filling material and the deformation of the pipe in the service process of the continuous pipe is ensured, and meanwhile, the defect filling material can effectively transfer the stress of a damaged position to the outer layer of the composite material repairing layer, so that the risk of further expansion failure of the damaged part is controlled; the defect filling material of the invention has simple field operation and no special requirement on the environmental temperature, the drying time is 1-2 hours under the room temperature condition, the working temperature is-40-150 ℃, and the service requirement of the field continuous tube is completely met.
2. The elastic modulus of the fiber reinforced material sheet material of the invention is in the range of (3-5) multiplied by 105MPa, tensile strength range of 2000-4000 MPa; the fiber reinforced material sheet is coated with the interlayer adhesive, and after the interlayer adhesive is cured, the fiber reinforced composite material is generated, has higher tensile strength, can transmit and share the pressure inside and outside the continuous pipe, prevents the expansion deformation of the pipe, and reduces the defectsThe tensile stress and strain are generated, so that the premature failure of the pipe caused by the surface damage of the continuous pipe is effectively prevented.
3. After the flexible copper metal mesh and the high-performance wear-resistant ceramic particle adhesive are cured, the composite enhanced wear-resistant layer is formed, the wear resistance of the repairing area of the continuous pipe is effectively enhanced, and the repairing area is prevented from being worn in the service process of the repairing area of the continuous pipe to cause premature failure of the repairing area, so that the repairing effect of the continuous pipe is influenced. And at the joint of the repair area and the continuous pipe, the rubber spatula is used for smearing the high-performance wear-resistant ceramic particle adhesive into a slope, so that the abrasion of the joint position in the service process of the continuous pipe can be reduced.
4. The invention adopts the vacuumizing method to carry out auxiliary curing on the composite material repairing layer, solves the problems of nonuniform infiltration of the interlayer adhesive and the fiber and non-tight bonding between the repairing layers and the pipe wall, and can avoid debonding, layering, hollowing, cracking and bubble generation during the curing period of the whole composite system. The heating auxiliary curing is adopted, so that the rapid and effective curing under the severe humid and cold environment is ensured, the construction period is shortened, and the repairing effect is ensured.
5. The defect filling material, the fiber reinforced composite material (comprising an interlayer adhesive and a fiber reinforced material sheet) and the composite reinforced wear-resistant layer (comprising a flexible copper metal mesh and a high-performance wear-resistant ceramic particle adhesive) developed by the invention realize that the composite material and the continuous pipe have good matching performance in strength and toughness, so that the stress born by a damaged position is transferred to the composite repairing layer, the stress concentration of the damaged position is effectively reduced, the bearing capacity of the pipe material at the damaged position is improved, meanwhile, the local corrosion of the damaged position is prevented, and the performance of the damaged continuous pipe reaches or exceeds that of a flawless continuous pipe, thereby effectively preventing the failure of the whole continuous pipe caused by local damage of the continuous pipe and realizing the improvement of the service life of the continuous pipe.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to specific examples.
In order to test the implementation effect of the technology, a brand new continuous pipe sample is taken, 3 common continuous pipe surface damage defects are simulated by machining equipment, and a hydraulic pressure bursting test and a low-cycle bending fatigue test are adopted for evaluation. The parameters associated with the test coiled tubing and simulated defects are shown in Table 1.
With reference to repair reinforcement design standard ASTM PCC-2-2006 (maintenance standard for pressure equipment and pipelines) and related calculation simulation software, the number of 3 defect reinforcement repair layers is estimated as follows: 3 layers, 4 layers and 4 layers (the thickness of the single-layer fiber sheet is 0.15mm, and the width is 150 mm).
TABLE 1 coiled tubing for testing and parameters associated with simulated defects
The method for reinforcing and repairing the surface damage continuous pipe by using the composite material provided by the invention has the following steps of:
step 1: carrying out damage positioning on the continuous pipe to be reinforced and repaired, and creating a working environment;
guiding a continuous pipe in service on an operation vehicle into a pipe guider, releasing the continuous pipe at one end of the operation vehicle, winding the continuous pipe at one end of the pipe guider, searching the position of the defect to be reinforced and repaired, and marking and positioning the area to be repaired by adopting a marking method, a spray mark method or other methods and using striking colors. The work environment is created by cleaning the work area, preparing various reinforcing materials and construction auxiliary equipment required by the reinforcing and repairing work, and building a scaffold if necessary.
Step 2: treating the damaged surface and the surface of the coiled tubing near the damage to remove dirt and oxide skin at the damaged part and ensure that the surface of the coiled tubing to be repaired is oil-free and water-free;
the damaged surface and the surface treatment of the pipe body near the damage are the basis and the key of the reinforcement and repair of the fiber composite material, the quality of the adhesion force between the repair layer and the pipe body is directly determined, and the debonding of the repair material and the pipe body can be directly caused if the surface treatment is not good. The surface base layer treatment is carried out by using an electric polishing tool, the base layer pretreatment quality reaches St 3 level specified in GB/T8923-1988 steel surface corrosion grade and rust removal grade before coating, the repaired surface is ensured to be oil-free and water-free, and impurities such as dirt, oxide skin and the like at the defect part are completely removed. If the surface of the pipe body has the defects of tiny and dispersed corrosion pits, the electric angle grinder is difficult to thoroughly polish and remove rust, the surface rust removing liquid can be used for treating the surface rust of the pipe body, and finally, the oil stain and other dirt on the surface of the pipe body are removed by alcohol, acetone or other volatile cleaning agents, and the pipe body is fully dried after being cleaned.
And step 3: repairing the damaged part of the pipe body by adopting a defect filling material to fill and level up the damage on the surface of the pipe body;
the weight ratio of the A component to the B component in the defect filling material is 6:1, and the specific components and the weight ratio of the A component to the B component are shown in Table 2.
TABLE 2 Defect Filler compositions and proportions
And 4, step 4: coating a fiber reinforced material sheet with an interlayer adhesive, and then sticking the fiber reinforced material sheet to the damaged part of the surface of the pipe body;
the weight ratio of the component C to the component D in the interlayer adhesive is 4:1, and the specific components and the weight ratio of the component C to the component D are shown in Table 3. When in use, a film is paved on the ground, a carbon fiber sheet is paved on the film (carbon fiber cloth: the tensile strength is 2500MPa, the width is 150mm), and the width of the carbon fiber sheet is designed and cut according to the actual damage condition. And coating the prepared adhesive on fiber cloth to fully soak the fiber cloth, and tightly winding and adhering the fiber sheet to the surface damage part and the surrounding area along the annular direction of the continuous pipe or at a certain angle with the axial direction.
TABLE 3 Components and proportions of interlaminar adhesive materials
And 5: a flexible copper metal mesh is adopted and is tightly attached to a fiber reinforced material sheet, a high-performance wear-resistant ceramic particle adhesive is coated and covered on the flexible copper metal mesh, and finally a composite material repairing layer consisting of a defect filling material, an interlayer adhesive, the fiber reinforced material sheet, the flexible copper metal mesh and the ceramic particle adhesive is formed. The thickness of the metal mesh is 0.5mm, the width is 150mm, the prepared finished product is generally directly used on site by the ceramic particle adhesive, and when the temperature of the use environment is lower, a certain curing accelerator can be properly added on site. And at the joint of the repair area and the continuous pipe, the rubber spatula is used for smearing the high-performance wear-resistant ceramic particle adhesive into a slope, so that the abrasion of the joint position in the service process of the continuous pipe can be reduced.
Step 6: and (3) performing auxiliary curing on the composite material repairing layer by adopting a vacuumizing or heating method, ensuring the quality of the repairing layer, and vacuumizing for 40 minutes.
And 7: and checking and accepting the repairing layer area of the continuous pipe, and making construction records.
And checking whether the repairing layer has debonding, layering, hollowing and cracking or not and whether the construction requirements are met or not. Performing site construction records, including: and recording time, place, pipe column information, surface damage size, reinforcement repair position, construction method, construction process, quality inspection and the like.
And (3) carrying out reinforcement and repair performance evaluation on the continuous pipe samples containing the defects by adopting a hydraulic bursting test. Plugging two ends of a coiled tubing sample by using plugs provided with water inlet holes and exhaust holes, injecting water and exhausting, pressurizing to 74.1MPa, maintaining pressure for 15min, and avoiding leakage and pressure drop (refer to a hydrostatic pressure test method in API Spec5ST coiled tubing specification); and then pressurizing step by step until the sample is exploded. As a result: the blasting pressures of 3 continuous tube samples containing defects are 124.6MPa, 120.1MPa and 120.9MPa respectively, and the blasting positions are pipe body positions which are not repaired and reinforced.
And (3) evaluating the reinforcement and repair performance of the continuous pipe samples containing the defects by adopting a continuous pipe low-cycle fatigue simulation test device. The test conditions and results are shown in table 4, and the results show that: after the 3 continuous tube samples containing defects are reinforced and repaired, the continuous tube samples have better low cycle fatigue resistance.
TABLE 4 test conditions and results
Claims (7)
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| CN114012877B (en) * | 2021-11-12 | 2023-04-21 | 航天特种材料及工艺技术研究所 | Reinforcing method of continuous carbon fiber toughened ceramic matrix composite |
| CN114233975B (en) * | 2021-12-27 | 2023-12-29 | 国家石油天然气管网集团有限公司 | SMC for repairing long oil and gas pipeline and construction method |
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| CN100363678C (en) * | 2004-10-27 | 2008-01-23 | 中国石油天然气集团公司 | Method for reinforcing defective pipeline and composite material therefor |
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